SBS掺量对改性沥青性能影响及指标关联研究

采用常规和SHRP等检测手段研究SBS掺量对改性沥青性能影响,并对表征改性沥青高温性能、低温性能的评价指标进行相关性研究。研究结果表明:随着SBS掺量增加,改性沥青常规性能、高温性能、低温性能均得以提高;改性沥青软化点、60℃动力黏度和高温临界温度在表征改性沥青高温性能方面具有良好的相关性,且软化点与高温临界温度的相关性优于60℃动力黏度;5℃延度、烘后延度和低温临界温度在表征改性沥青低温性能方面具有良好的相关性,且5℃延度与低温临界温度的相关性优于烘后延度。     

降粘剂对高掺量SBS改性沥青性能影响研究

研究了不同种类和掺量的降粘剂对高掺量SBS改性沥青软化点、针入度、延度、运动粘度、老化延度等常规指标的影响;通过动态剪切流变仪(DSR)进行沥青高温路用性能测定,研究了降粘剂对高掺量SBS改性沥青高温车辙性能的影响。结果表明,掺入降粘剂既可以降低高掺量SBS改性沥青的运动粘度,又可以提高改性沥青的高温性能。     

马来酸酐对SBS改性沥青的性能影响

分析了马来酸酐（MAH）不同掺量对SBS改性沥青微观结构和性能的影响。结果表明,随MAH掺量的增加,SBS改性沥青的软化点和针人度指数PI提高,但5℃延度降低。而改性沥青离析软化点差随MAH掺量增加,先减小后增大,表明相容性先改善后变差。     

PPA/SBS复合改性沥青的性能研究

研究了添加不同多聚磷酸(PPA)掺量的SBS改性沥青的性能,分析了多聚磷酸影响SBS改性沥青的机理。结果表明,随PPA掺量的增加,SBS改性沥青的软化点、135℃运动粘度、车辙因子、针入度指数、针入度比等技术指标逐渐增大,而RTFOT老化前后的5℃延度值、针入度值均下降。     

基质沥青中芳香分对改性沥青性能影响

对五种不同基质沥青进行性能和四组分分析,利用这五种沥青在相同工艺条件和配方下制备了五种改性沥青并对其进行性能对比分析。实验结果表明:基质沥青中芳香分对改性沥青产品储存稳定性和低温延度影响较大,芳香分含量越大,基质沥青与SBS相容性越好,制备的改性沥青产品具有较好的储存稳定性和较优良的低温延度。     

改性道路沥青的研制

以锦西石化分公司生产的辽河减压渣油为基质沥青,SBS为改性剂,采用适当的助溶剂,试制SBS改性道路沥青。相容剂对改性沥青的针人度、低温延度、软化点均有较大影响,选择合适的助溶剂添加粮是非常必要的。     

SBS改性沥青的研制

采用国产SBS掺入五种牌号的沥青中,研究了SBS用量、SBS在不同沥青中的分散形态及其对改性沥青性能的影响。认为以SBS在沥青中形成连续相且呈网状结构的改性沥青性能最佳。该改性沥青具有良好的抗高温流动性、耐冲击性,耐老化性和优异的低温性能,0℃时的延度达100 cm,回弹率85％,Fraas脆点<-35℃,针入度>0.7,耐热度86℃。改变SBS的掺入量,可以得到不同性能的改性沥青,以便满足不同路面和沥青油毡的需要。     

生产要素对特种I-D SBS改性沥青性能影响分析

本文选取绥中36-1基质沥青为原料,依次考察SBS掺量、增延剂掺量、相容剂掺量、发育时间对SBS改性沥青性能的影响。结果表明,使用一定比例的SBS、增延剂和相容剂,在适当的发育时间下,使得特种I-D改性沥青得到最优的改性效果。     

SBS改性沥青的老化行为

用红外光谱、凝胶渗透色谱、动态黏弹仪研究了苯乙烯-丁二烯嵌段共聚物(SBS)改性沥青的薄膜烘箱老化行为。结果表明，SBS改性沥青老化后增加了羰基和亚砜基；SBS和沥青的相对分子质量都发生了变化。沥青的相对分子质量增加，相对分子质量分布变宽，SBS特征峰消失；SBS改性沥青老化程度较基质沥青的小，耐低温性能更好；SBS改性沥青老化后，软化点增加，针入度减小，低温延度降低。     

不同S/B比例的SBS改性沥青的分散形态及性能

以两种组成比例不同的SBS(791、792)为例,研究了S／B质量比对改性沥青分散形态与性能的影响。结果表明：S／B不同的SBS由于与沥青的相容性不同,对改性沥青的分散形态与性能有所不同。同等质量分数下,S／B高的SBS改性沥青的针入度较小。小用量范围内S／B低的改性沥青软化点高;用量超过5％后,S／B高的改性沥青软化点则较高。S／B低的改性沥青的5℃延度较好,弹性恢复率也较优。当SBS含量为5％时,S／B低的改性沥青的稳定性更好。     

Preparation and properties of bitumen modified with the maleic anhydride grafted styrene‐butadiene‐styrene triblock copolymer

A procedure to improve the properties of styrene‐butadiene‐styrene (SBS) copolymer modified bitumen by grafting of maleic anhydride (MAH) onto SBS in the presence of benzoyl peroxide (BPO) as initiator was proposed. The effects of the grafting degree (GD) on the properties of modified bitumen were investigated. FTIR spectroscopy was employed to verify the grafting of MAH onto SBS. The GD of MAH onto SBS was determined by a back titration procedure. To assess the effects of the GD of grafted SBS on properties of modified bitumen, the softening point, penetration, ductility, elastic recovery, penetration index, viscosity, storage stability, and dynamic shear properties were tested. Experimental results indicated that the SBS grafted with maleic anhydride (SBS‐g‐MAH) copolymer was successfully synthesized by solvothermal method, and different GD of the SBS‐g‐MAH was obtained by control the MAH concentration. The GD of the MAH onto SBS has great effect on the rheological properties of the modified bitumen, and the high temperature performance and storage stability of modified bitumen were improved with the GD of the MAH onto SBS increasing. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers     

Effect of montmorillonite on properties of styrene–butadiene–styrene copolymer modified bitumen

Clay/styrene–butadiene–styrene (SBS) modified bitumen composites were prepared by melt blending with different contents of sodium montmorillonite (Na‐MMT) and organophilic montmorillonite (OMMT). The structures of clay/SBS modified bitumen composites were characterized by XRD. The XRD results showed that Na‐MMT/SBS modified bitumen composites may form an intercalated structure, whereas the OMMT/SBS modified bitumen composites may form an exfoliated structure. Effects of MMT on physical properties, dynamic rheological behaviors, and aging properties of SBS modified bitumen were investigated. The addition of Na‐MMT and OMMT increases both the softening point and viscosity of SBS modified bitumens and the clay/SBS modified bitumens exhibited higher complex modulus, lower phase angle. The high‐temperature storage stability can also be improved by clay with a proper amount added. Furthermore, clay/SBS modified bitumen composites showed better resistance to aging than SBS modified bitumen, which was ascribed to barrier of the intercalated or exfoliated structure to oxygen, reducing efficiently the oxidation of bitumen, and the degradation of SBS. POLYM. ENG. SCI., 47:1289–1295, 2007. © 2007 Society of Plastics Engineers     

昆仑-欢喜岭SBS改性沥青的稳定性研究

昆仑-欢喜岭重交通道路沥青与SBS具有良好的配伍性,采用适当工艺,选择良好配伍的SBS改性剂,添加不同类型的稳定剂,使SBS与稳定剂发生化学反应,降低两种材料的界面能。对比基于现场改性不添加稳定剂的改性沥青,热储存稳定性及高温性能均明显改善,适于基地式生产并较长时间贮存,使用性能优异。     

自粘聚合物改性沥青防水卷材胶粘剂

在SBS改性沥青防水卷材表面涂敷一层自粘性胶粘剂并以隔离纸覆盖，使用时撕掉隔离纸直接粘贴于屋面即可粘接密封牢，不但施工方便而且消除了熔融法施工造成的污染。该胶粘剂由沥青40％～65％，SBS 5％～30％，增粘剂2％～25％和助剂5％～25％构成。胶层具有可塑性、延展性，可自行填补屋面出现的裂缝，保证防水卷材的防水密封效果。     

SBS改性沥青的基本性能的实验研究

利用SBS对AH-90沥青进行了改性研究,并对改性沥青的软化点、延度、针入度等性能进行表征.结果表明,随着SBS用量的增加,改性沥青的软化点上升,针入度降低,延度增加;但是当SBS用量增加至6%时,针入度降至国家标准以下.因此,SBS用量在4.5%～5.5%时,改性沥青的软化点、延度、针入度等基本性能最好.     

Rheological properties of styrene butadiene styrene polymer modified road bitumens

The use of polymers for the modification of bitumen in road paving applications has been growing rapidly over the last decade as government authorities and paving contractors seek to improve road life in the face of increased traffic. Currently, the most commonly used polymer for bitumen modification is the elastomer styrene butadiene styrene (SBS) followed by other polymers such as styrene butadiene rubber, ethylene vinyl acetate and polyethylene. This paper describes the polymer modification of two penetration grade bitumens with SBS. Six polymer modified bitumens (PMBs) were produced by mixing the bitumens from two crude oil sources with a linear SBS copolymer at three polymer contents. The rheological characteristics of the SBS PMBs were analysed by means of conventional as well as dynamic mechanical analysis using a dynamic shear rheometer (DSR). The results of the investigation indicate that the degree of SBS modification is a function of bitumen source, bitumen-polymer compatibility and polymer concentration, with the higher polymer concentrations in a high aromatic content bitumen producing a highly elastic network which increases the viscosity, complex modulus and elastic response of the PMB, particularly at high service temperatures. However, ageing of the SBS PMBs tends to result in a reduction of the molecular size of the SBS copolymer with a decrease in the elastic response of the modified road bitumen.     

沥青改性用SBS市场分析及生产开发建议

通过对国内外苯乙烯类热塑性弹性体SBS产品在制鞋、沥青改性、聚合物改性和粘合剂等方面的市场及消费需求分析,预测了SBS产品在改性沥青行业的需求情况和发展趋势。随着国内高等级高速公路的快速发展,我国对改性沥青用SBS的需求量将会有较大的增长。针对我国目前的生产实际情况,提出了下一步改性沥青用SBS的生产开发建议。     

SBS对沥青性能的影响

通过测试软化点、针入度和延度对SBS改性沥青的性能进行表征.结果表明:使用线型或星型SBS作为沥青改性剂可以显著提高沥青性能.当硫黄稳定剂质量分数为0.2％,SBS质量分数为4％时,改性沥青的软化点、针入度和延度趋于稳定.此外,相较于线型SBS改性,星型SBS改性沥青的软化点稍高,针入度和延度相对更小.     

Evaluation of the properties of bitumen modified by SBS copolymers with different styrene–butadiene structure

Four styrene–butadiene–styrene(SBS) modified bitumens had been prepared by a base bitumen, a crosslinking agent and four SBS copolymers which differ in styrene blocks content and molecular configuration (radial or linear) under the same experimental conditions. Conventional properties, morphology, thermal behavior and microstructure were investigated by means of conventional tests, fluorescence microscopy, differential scanning calorimetry (DSC), and Fourier transform infrared (FT‐IR) spectroscopy. In terms of linear SBS polymers, the SBS molecule with the styrene content of 30% has a perfect dispersion and complete stretching in bitumen matrix, and in this case, the conventional properties and thermal stability of bitumen are enhanced substantially. However, the star SBS polymer due to long branched chains forming the preferable steric hindrance to enhance the intensity of base bitumen, plays a more important role in improving the conventional properties of base bitumen than linear SBS polymers. Furthermore, the FT‐IR spectra indicate that, the main bands assignations of four modified bitumens are identical and the significant variation is the peak intensity. And a noncomplete crosslinking reaction happens between the bitumen and each SBS polymer, which can efficiently prevent excessive cross‐linking from affecting the intrinsic bitumen characteristics. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40398.     

Evaluation of physical,rheological, and structural properties of vulcanized EVA/SBS modified bitumen

In this study, the performance and modification mechanism of EVA (ethylene‐vinyl‐acetate) modified (EM), EVA/SBS (Styrene‐Butadiene‐Styrene) modified (ESM), and EVA/SBS/sulfur modified (ESSM) bitumens were evaluated. The physical, rheological, morphological, and structural properties were determined before and after aging, and compared with those of base bitumen. These properties were evaluation using conventional physical methods, Fourier transform infrared spectrometer, optical microscopy, dynamic shear rheometer, and bending beam rheometer, respectively. The results showed that sulfur was useful in bitumen, EVA, and SBS modification by forming a vulcanized crosslinking polymer network. The vulcanization improved most of the physical properties of ESM bitumen, especially high‐ and low‐temperature performance, and toughness and tenacity (previously not evaluated in the literature). Meanwhile, vulcanization improved the compatibility between polymers and bitumen and increased the aging resistance of ESM bitumen. Vulcanization reactions took place without new functional groups being presented in the infrared spectrum. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44850.